Even if they can be used metaphorically, I think it's unlikely that such a use lines up with ours 100% so outside of those specific case outlined by Frommer, I'd avoid it. (Irayo ma plumps for finding that btw).

LearnNavi is not affiliated with the official Avatar website,
James Cameron, LightStorm Entertainment or The Walt Disney Company.
All trademarks and servicemarks are the properties of their respective owners.Images in the LearnNavi.org Forums and Gallery may not be used without permission.

LearnNavi Affiliates:

LearnNavi is the community to learn Na'vi, the Avatar Language"A place where real friendships are made." -Paul Frommer